Undermountain Dungeon Crawls

I have all the Undermountain Dungeon Crawls (The Lost Level, Hellgate Keep... also the Ruins boxed set) and was going to drop them (well, probably one) into my campaign. So I need to convert from 2nd Edition to 3.5

If anyone would care to assist in the effort...
...or better yet, has a conversion already, please lemme know.